All you have to do is taking the red flag on the opposite side of the island. If you success another flag will appear on the other side, and so on. Your time is refreshed each time you take a flag.
If you capture 2 / 5 / 10 / 15 flags you will unlock permanent skills.
If you reset the cart your skills and hi-score will be reset too.

commands are : <left> and <right> to run, <up> to jump and <up> again to explo-double-jump ( need unlock )

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Also a great little nugget of a game. However prob not as enjoyable as it has the potential to be. The size of the screen and the speed of the enemies can mean a lot of what feel like cheap deaths. For example the mischievous shark has killed me more than once because I had not enough time to react to it suddenly popping out from behind the notification of the stage change.
Piranhas and pangolins also killed me in similar ways.
Maybe smaller hitbox , slower enemy or screen scrolls a bit faster ahead of you?

The bomb jump costs time seems too cruel, especially if you get nailed with a bunch of screen extensions in a row. As the bomb jump also seems to be hair trigger and often goes off without or barely pressing the jump button. So that's bad.

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I'll be honest. I love this game, but I wish it reset your powerups every time. I like that first game experience where you're leveling up, but so is the island. It really feels like the difficulty curve is ramping with you.

Also, make a button do the jump. You can keep the Dpad as well if you like, both of them, but make the button jump.

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this is so great!!! i keep finding myself coming back to it every day and getting a little further each time i play!!

what others have said about the jump button thing is definitely a good idea imo. today ive actually edited my copy of the cart to set X as jump, and found the game became even more enjoyable after that! here's a quick gif of the code change in case anyone else wants to do the same. you only have to change one btnp() call.

until i made this edit i'd only used btn(), so this was how i learned about btnp() and i'm stoked cos it's gonna make my own game a little better 💕